B. Harazin et J. Grzesik, THE TRANSMISSION OF VERTICAL WHOLE-BODY VIBRATION TO THE BODY SEGMENTS OF STANDING SUBJECTS, Journal of sound and vibration, 215(4), 1998, pp. 775-787
The effects of body postures in standing position on the transmission
of whole-body vibration to body segments have been investigated. The m
agnitude acceleration in the 2-axis direction of six body segments: th
e metatarsus, ankle, knee, hip, shoulder and head has been measured du
ring exposure to random vibration. Ten male subjects exposed to floor
vibration stood in ten postures described as: relaxed standing, legs s
tiffened, legs bent, standing on the toes, standing on one leg with or
without support of the other foot and standing in steps. The transmis
sibility of random vibration from the floor to the body points was cal
culated at frequencies ranging from 4-250 Hz in 1/3 octave bands. The
body postures of the subjects modified both the width of the resonant
bands and the transmissibility values. The squared multiple correlatio
n coefficient (R-2) between the transmissibility and the 16 variables
(10 postures, 6 body segments) was not very high at resonance frequenc
ies in the range 4-12.5 Hz but above 25 Hz, 50% of the variability in
the transmissibility was due to the postures and the body segments. (C
) 1998 Academic Press.